git: openjdk/loom: fibers: Fix, cleanup, and greatly simplify threadControl_continuationRun(). It wasn't working properly for vthreads, causing a step into a library method (with library filtering enabled) to not resume single stepping properly.

[duke]

Changeset: 91c7e92f
Author:    Chris Plummer <chris.plummer at oracle.com>
Date:      2020-12-15 20:26:04 +0000
URL:       https://git.openjdk.java.net/loom/commit/91c7e92f

Fix, cleanup, and greatly simplify threadControl_continuationRun(). It wasn't working properly for vthreads, causing a step into a library method (with library filtering enabled) to not resume single stepping properly.

! src/jdk.jdwp.agent/share/native/libjdwp/threadControl.c